1991 Chevy Blazer knocking noise

1991 CHEVROLET BLAZER
80,197 MILES • 6 CYL • 4WD • AUTOMATIC
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KCWRESTLER08
  • MEMBER
  • 2 POSTS
sometimes when idling and driving there is a knocking sound it doesnt sound like it is coming from the engine more like underneath the driver seat. what could this be
Dec 8, 2008 at 4:06 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Hi:
There really isn't anything under the seat that would cause the described noise. The next time you hear it, see if you can get a different location of the noise. It could be coming from the rear main or the trans.

Let me know what you find.

Joe
Dec 9, 2008 at 5:31 AM
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KCWRESTLER08
  • MEMBER
  • 2 POSTS
i think it may be the transfer case for my four wheel drive. but im not sure
Dec 10, 2008 at 2:55 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
When you get a chance. check the drive shaft yoke where it goes in the transfer case. See if there is any play (up / down / left / right) and let me know what you find. There is a bearing in the tail shaft housing that may be giving you trouble.

Joe
Dec 10, 2008 at 5:20 AM
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